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COMMITMENTS AND CONTINGENCIES - CL&P Comprehensive Settlement Agreement (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Oct. 01, 2021
Sep. 30, 2021
Sep. 30, 2020
Jul. 14, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]          
Regulatory Liabilities   $ 612,931     $ 389,430
Loss related to litigation settlement   103,583 $ 0    
CL&P          
Loss Contingencies [Line Items]          
Regulatory Liabilities   311,269     $ 137,166
Loss related to litigation settlement   103,583 $ 0    
Subsequent Event          
Loss Contingencies [Line Items]          
Basis points reduction to return on equity, scenario one 0.90%        
Basis points reduction to return on equity, scenario two 0.45%        
Unfavorable Regulatory Action          
Loss Contingencies [Line Items]          
Loss related to litigation settlement   103,600      
Loss related to litigation settlement, net of tax   $ 85,800      
Loss contingency, after-tax earnings impact per share (in dollars per share)   $ 0.25   $ (0.07)  
Unfavorable Regulatory Action | Sales          
Loss Contingencies [Line Items]          
Loss related to litigation settlement   $ 65,000      
Unfavorable Regulatory Action | Oil and Gas, Operation and Maintenance          
Loss Contingencies [Line Items]          
Loss related to litigation settlement   10,000      
Unfavorable Regulatory Action | CL&P          
Loss Contingencies [Line Items]          
Regulatory Liabilities   $ 75,000      
Unfavorable Regulatory Action | Subsequent Event          
Loss Contingencies [Line Items]          
Customer credits $ 65,000        
Customer assistance initiatives 10,000        
Customer credits and assistance $ 75,000